Avery, forty-five, explained what she sought in an OP (outside partner) and how she vetted candidates: “I ask penis size, availability, and what kind of associations they are looking for, what sex acts they enjoy. And that’s all in the first email.” Heather, thirty-three and partnered, told Walker, “In an OP, I want (this sounds shallow) a big cock, stamina, knowledge of female anatomy, and discretion.” The women also had clear ROE (rules of engagement). They avoided men who seemed emotionally needy or who seemed to want relationships rather than liaisons. They had complicated primary
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